Geometric Mean Calculator
Compute the geometric mean of a list of positive numbers — useful for averaging growth rates and ratios.
Calculators and explainers tagged under Statistics.
Compute the geometric mean of a list of positive numbers — useful for averaging growth rates and ratios.
Count how many ways to choose or arrange r items from a set of n — both nPr and nCr, with a short breakdown of why they...
Compute a normal-approximation (Wald) confidence interval for a sample proportion, given the sample proportion p̂, the s...
Calculates the variance and standard deviation of a binomial distribution from trial count n and success probability p.
Calculates break point conversion percentage in tennis from break points won and break points faced.
Calculates the minimum sample size needed for a survey or proportion estimate at a specified confidence level and margin...
Calculates the mean and standard deviation of an exponential distribution from the rate parameter λ.
Compute the Pearson correlation coefficient (r), r², and the slope/intercept of the best-fit line for two equal-length l...
Compute the arithmetic mean (average), median, mode, range, geometric mean, and harmonic mean of a list of numbers.
Compute the range (max − min), along with the minimum, maximum, and count of a list of numbers.
Compute Cohen's d effect size = (M₁ − M₂) / SD_pooled, with rule-of-thumb interpretation (0.2 small, 0.5 medium, 0.8 lar...
Population and sample variance of a dataset, with the standard deviation shown alongside.
Calculates the standard score z from a raw value, mean, and standard deviation, then estimates the cumulative normal per...
Work out how many respondents you need for a given confidence level, margin of error, and population size.
Compute the lower and upper bounds of a confidence interval for a sample mean given the sample size, mean, standard devi...
Calculates the mean (expected value) of a hypergeometric distribution from population size N, successes K, and sample si...
Compute the percentile rank of a chosen value within a list of numbers — the percentage of values that fall at or below...
Calculates Spearman's rank correlation coefficient rs from the sum of squared rank differences and number of observation...
Standard deviation is "average distance from the average". That one sentence covers 90% of everything you ever need to remember about it.